I've built two. I use them to feed cows and are not stationary.
How big are your rolls of hay? Weight wise? The two I built are 3 point and use a hudraulic motor to spin the hay off. It could be mounted on the front end loader also. Just never had any need for that. I built these to handle up to 1,300 pound rolls. Maybe more, just never tried one larger than that. They can be built for 2,000 pound rolls also. Just use a larger everything. /forums/images/graemlins/cool.gif
I see you're new here. When you post again fill us in on what tractors and equipment you have. May be able to answer your questions a little better.